padua, a C++ code which returns the coordinates of the 2D Padua points, as well as interpolation weights or quadrature weights, and images of the points in gnuplot graphics files.
The computer code and data files made available on this web page are distributed under the MIT license
padua is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
gnuplot_test, C++ codes which illustrate how a program can write data and command files so that gnuplot can create plots of the program results.
LAGRANGE_INTERP_2D, a C++ code which defines and evaluates the Lagrange polynomial p(x,y) which interpolates a set of data depending on a 2D argument that was evaluated on a product grid, so that p(x(i),y(j)) = z(i,j).
PWL_INTERP_2D, a C++ code which evaluates a piecewise linear interpolant to data defined on a regular 2D grid.
QUADRATURE_WEIGHTS_VANDERMONDE_2D, a C++ code which computes the weights of a 2D quadrature rule using the Vandermonde matrix, assuming that the points have been specified.
RBF_INTERP_2D, a C++ code which defines and evaluates radial basis function (RBF) interpolants to 2D data.
SHEPARD_INTERP_2D, a C++ code which defines and evaluates Shepard interpolants to 2D data, based on inverse distance weighting.
TEST_INTERP_2D, a C++ code which defines test problems for interpolation of data z(x,y), depending on a 2D argument.
TOMS886, a C++ code which defines the Padua points for interpolation in a 2D region, including the rectangle, triangle, and ellipse, by Marco Caliari, Stefano de Marchi, Marco Vianello. This is ACM TOMS algorithm 886.
VANDERMONDE_INTERP_2D, a C++ code which finds a polynomial interpolant to data z(x,y) of a 2D argument by setting up and solving a linear system for the polynomial coefficients, involving the Vandermonde matrix.